Form-lock extension.



J. J. JOHNSON.

FORM LOCK EXTENSION.

APPLICATION FILED JULY 24,1915.

1,172,213, Patented Feb. 15,1916.

2 SHEET-SHEET 1.

15.1 U2; 6" 3 Seem/wk Jameleiz'hmam THE COLUMBIA PLANOGRAPH c0.WASHINGTON. D. c.

J. J. JOHNSON.

FORM LOCK EXTENSION.

APPLICATION FILED JULY 24.1915.

Patented Feb. 15, 1916.

2 SHEETS-SHEET 2 amwm JamJfJaimsom 1 COLUMB JOHN J. JOHNSON, OF QT.PAUL, MINNESOTA.

FORM-LOCK EX"31EIN'SIOTLQ".

Specification of Letters Patent.

Patented Feb. 15 21916.

Application filed July 24, 1915. Serial Ito. 41,703.

- To all whom it may con Ja n:

Be it known that I, J 01in J .J oi-inson, a citizen of the UnitedStates, residing at St. Paul, in the county of Ramsey and State ot' lilinnesota, have invented new and useful improvements in Form-LockExtensions, oi which the following is a specification.

.This invention relates to form lock extensions and it consists in thenovel features hereinafter described and claimed.

An object of the invention is to provide a form lock especially adaptedto be used upon cylinder presses for securing the form in properposition upon the bed of the press without necessitati a the use offurniture and which may be easily and quickly operated for the purposeof locking the form in the desired position.

In large printing establishments the desired sizes of form locks arenotalways at hand for locking the forms in position. When this is the caseit has been the practice heretofore to use furniture which is made ofwood and which is usually warped or out of shape. Consequently, whensmall form is placed on the press the largest sizes 01" the furnitureblocks are required to be used in conjunction with the kicking devices.l-Vhen such is the case the sides of the form have to be braced and theform under certain size is always looked to the feeder side which divesquite a space on thefarther side of the form. Therefore, frequently itis necessary to use two extensions for the purpose of properly lockingthe form in,

trouble lies in keeping; the form solid on the bed. and to prevent it"from bulging and jumping from the bed which it sometimes does. Toovercome the foregoingobjections the present form lock extension hasbeen devised, and the same consists of one cross bar that reaches fromone barrier to the other and is set in the barrier about onefourth of aninch to keep it from bulging up. This cross bar also has attached to itthree ratchet bars. one at each end. and one at a point between its endsto keep the cross bar true. The said ratchet bars pass under the inkplate and thus a. full size form can be placed upon the type bed andoperated upon by the cross bar. For smaller forms it is customary topull the cross bar forward until ittightly engages the form. and thuscross bar 4c the possibility of the form lifting from the type bed isprevented. Pawls are mounted on the end bit the type bed, between theedges of the ink plate. and are actuated by a cam rod to ngae'e theteeth of the ratchet bars, and therefore. the said cross bar held inposition against the form. A rotatable shaft extends from the front ofthe type bed and carries a pinion which engages ratchet teeth upon thecam rod and therefore the said rod may be easily and quickly moved. atwill.

In the accompanying drawings F igure 1 is a top plan view of the formlock ere tension. Fig. 2 is a transverse sectional view of the form lockillustrating the cam rod thereof in side elevation. Figs. 3 and a aredetailed t'ansverse sectional views of the cam rod taken at differentpoints and showing adjacent parts in section. Fig. 5 is a detail sideelevation of part of thecam rod and showing cooperative parts insection.

Fig. 6 is a plan view of part oi the cam rod and adjacent parts.

As illustrated in the accompanying dran ing the form lock extensioncomprises a type bed 1 provided at its side edges with upstandingbarriers 2 having; at their inner sides longitudinally disposed groovesA. is movably mounted upon the type bed 1 and the ends of the cross bar1 enter the grooves 3 whereby the said cross bar is held down in properposition upon the said type bed 1. The cross bar a provided I with fixedratchet bars 5, one located at each end of the cross bar 4 and the outeredge portions of the terminal ratchet bars 5 lie in the grooves 3 andare adapted to move along the same. One or more intermediate ratchetbars 5 may be provided upon the cross bar 4 and when one is used it ispositioned at a point approximately midwa between the ends of the crossbar 4. The bars 5 are provided at their under sides with ratchet teeth6. An ink plate 7 is mounted on the end of the type bed with the ends ofthe ratchet bars 5 passing under the ink plate. Guides 8 are mounted atthe edge of the type bed 1 and lie under the ink plate T A shaft 12 isjournaled under the gear teeth 11. The shaft 12 is provided 7 at itsforward end with a knob 1-l which may be used for the purpose ofrotating the said shaft. The type bed 1 is provided at its rear edgewith extensions 15, having Pawls 17 are movably mounted in the pockets15 and the pockets 16 located therein.

cams 10 of the rod 9 lie in openings 18 provided in the said pawls.Springs 19 are located in the bottoms of the pockets 16 and gage withthe teeth 6 of one of the ratchet bars 5.

From the above description taken in conjunction with the accompanyingdrawing it will be seen that when a form is placed upon the type bed 1,the cross bar 4 maybe pulled in a forward direction until it engages theform, whereby the form is securely held in position upon thetypebed.When the cross bar 1 is pulled in a forward direction the ratchet bars 5follow the same and consequently, the teeth 20 of the pawls 17 engagethe teeth 6 of the bars 5 and hold the said bars and the cross bar at inthe adjusted positions referred to. When it is desired to disengage theteeth 20 of the pawls 17 from the teeth 6 ofithe ratchet bars 5, theshaft 12 is rotated, whereby the pinion 1.3 engaging the teeth 11 movesthe cam rod 9 longitudinally in the guides 8.

Therefore the lower edges of the cams .10

vmove along the lower sides of the openings 18 in the pawls 17 and thesaid pawls are moved in a downward direction against the influence ofthe springs 19 and the teeth .20 of the pawls 17 are disengaged from theCopies of this patent may be obtained for five cents each, by addressingWashington, 'D. 0.

teeth 6 located at the under sides of the ratchet bars 5. Therefore thepawls 17 are [tioned upon the type bed 1.

Thus it will be seen that a form lock extension of'simple'and durablestructure is provided and that the same'maybe easily and quicklyoperated to securely hold a form in position and when the form is heldby the lock extension the possibility of its dropping or springing fromthe type bed by reason of an insecure fastening means is prevented.

Having described the invention what is claimed is In combination with atype bed, a form lock extension comprising a cross bar mo-vably mountedupon the bed and having ratchet bars connected therewith, guides mountedon the bed, a cam rod inovably mounted in the guides and provided withcams, said cam rod also having a set of gear teeth, a shaft journaledunder the bed, a pinion carried by the shaft and meshing with the teethof the cam rod, pawls movably mounted in the bed and vengageable withthe teeth of the ratchet bars, said pawls having openings adapted toreceive the cams upon the cam rod and springs located under the pawlsand engaging the same and being under tension with a tendency to holdthe pawls toward the teeth upon the ratchet bars. p a

-In testimony whereof I affix my signature in presence of two witnesses.

, J OHN J. JOHNSON. Witnesses JOHN E. LoF'rFmLD,

CHARLES H.

the Commissioner of Patents,

